Timing adjustment in CV2X

1. A method of wireless communication, comprising:

receiving a first timing reference signal and a second timing reference signal at a local device, wherein the second timing reference signal includes an internal timing reference;

receiving a timing indication from a remote device, wherein the timing indication includes a value equaling to twice a propagation delay;

determining the propagation delay by dividing the value by 2;

calculating a timing offset by subtracting an arrival time of the first timing reference signal by the propagation delay;

adjusting the internal timing reference based on the timing offset; and

transmitting a message based on the adjusted internal timing reference.

2. The method of claim 1 , wherein the second timing reference signal includes a global positioning system (GPS) signal.

3. The method of claim 1 , further comprising determining, prior to adjusting the internal timing reference, that an external timing reference is more accurate than the internal timing reference.

4. The method of claim 1 , further comprising sending the calculated timing offset to the remote device.

5. The method of claim 1 , further comprising communicating with a third device based on the internal timing reference.

6. The method of claim 1 , further comprising sending the calculated timing offset to a third device.

7. The method of claim 1 , further comprising receiving second message from the remote device based on the internal timing reference.

8. A method of wireless communication, comprising:

receiving a first timing reference signal and a second timing reference signal at a local device, wherein the second timing reference signal includes an internal timing reference;

receiving a timing indication from a remote device, wherein the timing indication includes a value equaling to a sum of a propagation delay and a timing offset;

determining the propagation delay by dividing an arrival time of the first timing reference signal by 2;

calculating the timing offset by subtracting the value by the propagation delay;

adjusting the internal timing reference based on the timing offset and

transmitting a message based on the adjusted internal timing reference.

9. The method of claim 8 , further comprising determining, prior to adjusting the internal timing reference, that an external timing reference is more accurate than the internal timing reference.

10. The method of claim 8 , further comprising sending the calculated timing offset to the remote device.

11. The method of claim 8 , further comprising communicating with a third device based on the internal timing reference.

12. The method of claim 8 , further comprising sending the calculated timing offset to a third device.

13. The method of claim 8 , further comprising receiving second message from the remote device based on the internal timing reference.

14. A method of wireless communication, comprising:

receiving a first timing reference signal and a second timing reference signal at a local device, wherein the second timing reference signal includes an internal timing reference;

receiving a timing indication from a remote device, wherein the timing indication includes a value equaling to a difference of a propagation delay and a timing offset;

calculating the timing offset by dividing a difference of an arrival time of the first timing reference signal and the value by 2;

adjusting the internal timing reference based on the timing offset; and

transmitting a message based on the adjusted internal timing reference.

15. The method of claim 14 , further comprising:

determining, prior to adjusting the internal timing reference, that an external timing reference is more accurate than the internal timing reference.

16. The method of claim 14 , further comprising sending the calculated timing offset to the remote device.

17. The method of claim 14 , further comprising communicating with a third device based on the internal timing reference.

18. The method of claim 14 , further comprising sending the calculated timing offset to a third device.

19. The method of claim 14 , further comprising receiving second message from the remote device based on the internal timing reference.

20. A method of wireless communication, comprising:

receiving a first timing reference signal and a second timing reference signal at a local device, wherein the second timing reference signal includes an internal timing reference;

receiving a timing indication from a remote device, wherein the timing indication includes a value equaling to a sum of a propagation delay and a timing offset;

calculating the timing offset by dividing a difference of the value and an arrival time of the first timing reference signal by 2;

adjusting the internal timing reference based on the timing offset; and

transmitting a message based on the adjusted internal timing reference.

21. The method of claim 20 , further comprising determining, prior to adjusting the internal timing reference, that an external timing reference is more accurate than the internal timing reference.

22. The method of claim 20 , further comprising sending the calculated timing offset to the remote device.

23. The method of claim 20 , further comprising communicating with a third device based on the internal timing reference.

24. The method of claim 20 , further comprising sending the calculated timing offset to a third device.

25. The method of claim 20 , further comprising receiving second message from the remote device based on the internal timing reference.

26. A local device, comprising

a memory;

a transceiver; and

one or more processors operatively coupled with the memory and the transceiver, the one or more processors being configured to:

receive, via the transceiver, a first timing reference signal and a second timing reference signal at the local device, wherein the second timing reference signal includes an internal timing reference;

receive, via the transceiver, a timing indication from a remote device, wherein the timing indication includes a value equaling to twice a propagation delay;

determine a propagation delay by dividing the value by 2;

calculate a timing offset by subtracting an arrival time of the first timing reference signal by the propagation delay;

adjust the internal timing reference based on the timing offset; and

transmit, via the transceiver, a message based on the adjusted internal timing reference.

27. A non-transitory computer-readable medium having instructions stored therein that, when executed by one or more processors of a local device, cause the one or more processors to:

receive a first timing reference signal and a second timing reference signal at the local device, wherein the second timing reference signal includes an internal timing reference;

receive a timing indication from a remote device, wherein the timing indication includes a value equaling to twice a propagation delay;

determining the propagation delay by dividing the value by 2;

calculate a timing offset by subtracting an arrival time of the first timing reference signal by the propagation delay;

adjust the internal timing reference based on the timing offset; and

transmit a message based on the adjusted internal timing reference.